Electrician&#39;s joist-boring tool



J. c. MOORE. ELECTRICIANS JOIST BORING TOOL.

APPLICATION FILED JAN- 26, I920- Patented Sept. 27,1921.

o oooooo UNITED STATES.

JAMES o. moons, of siurnna, NEW Yonk.

nrno rnroraivs JoIs'r-BoR'ING TOOL.

p fication of Letters Patent- Patented Sept. 27 1921.

Application filed. January 26, 1920. [Serial No; 354,312.

To all whom it may concern: I

Be it "known that I, JAMES CLARENCE Moonn, citizen of the United States,and a resident of Smyrna, in the county of Chenango and State of NewYork, have invented a new and Improved Electricians Joist- Boring Tool,of which the following is a full, clear, and exact description.

My invention relates to a certain novel and useful improvement in boringmachines, and specifically appertains to a mechanism of the typereferred to designed especially for use in boring holes in the joists ofceilings or floors for the passage of concealed electric wires.

An object of the invention is to provide an improved boring toolcompact'in a small area of space which tradesmen easily can carry aboutin their tool bag without the inconveniences caused by the larger boringmachines. r

A further object of the invention is to materially reduce the length ofthe machine from front to rear in order that it may be convenientlyintroduced between beams, joists and the like, particularly when theyare closely arranged.

Still a further object of the invention is the combination andarrangement of the gears; gear shafts and gear bearings in a.

one piece gear casing and its cover, within a small area of space, so asto provide simplicity and high speed, the latter Which is essential inperforming quick work.

With the above recited objects and others of similar nature in View, myinvention consists in the combination and arrangement of parts, as willbe hereinafter more fully de scribed, shown in the accompanyingdrawings, and particularly pointed out in the appended claim, it beingunderstood that changes in the form, proportion, size and minor detailsmay be made within the scope of the claim without departing from thespirit or sacrificing any of the advantages of the invention.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a vertical sectional view of my machine embodying myimprovements, said view also illustrating the manner of applying thesame when used.

Fig. 2 is an end elevation thereof.

Fig. 3 is an elevation view of the steady-- ing rod bracket showing theside of said bracket which is fastened under the clamping nut of thesteadying rod.

Fig. 4 is an elevation view of the steadying rod bracket showing theside of said bracket which is at right angles to Fig. 3 and receives thesteadyingrodi Fig. 5 is a detail view of one of the grips used in theconstruction of the bit chuck.

Referring now to the accompanying drawlng in detail, the turning handle30 is adapted to turn or revolve freely on its connecting bolt 31 thesaid bolt fixed solidly to driving gear A. The driving gear A is looselyrotatable on a stationary shaft 1 secured by washer 3 and locknut 4 andmeshes witha-nd imparts motion to gear B, the said gears being mountedoutside of the casing cover 29 and adjacent'to the front side there of.Gear B is fastened by a groove key to rotating shaft 9,the said shaftvextending through casing'cove'r 29 rotatingin bearings 2-and carryinggear C thesaid gear being solidly fastened to shaft Q'bya groove key.

.Gear C meshes with and imparts motionto gear D within the casing, thelatter screws onto rotating bit chuck shaft 17. A pin is driven throughgear I) and shaft 17 to prevent loosening. An end portion of shaftl'?that turns or revolves in projecting bearing 19 in the casing cover ismachined or turned down by lathe until the threads are removed makingthat end of shaft smaller at 18. The revolving shaft 17 extends throughthe back portion of the casing 28 just sufficient to manipulate the bitchuck gripping bit 25. j

The bit chuck is constructed with a hollow cylinderv 22 threaded insideat one end with nut 21 screwed into said end of cylinder and fastened bypin 23.

Fig. 5 shows detail view of one of the bit chuck jaws. The shank of thebit rests in grooves 26 and 27.

Jaws 24: are adjusted by revolving cylinder 22 around on shaft 17 bythreads 20.

The steadying handles 8 consist of two L-shaped rods 7 threaded at theends which extend through the projecting portions (15) jecting part 14of the said bracket, while projecting pieces 11, 12, 13 merely pressagainst the casing. The bracket supports steadying rod 16, the said rodresting in holes 10. The lower portion of case and cover are connectedby bolt 32.

F romthe above description, taken in connection with the drawings, themanner of employing my machine will be readily apparent. 7 p

The horizontal rod 16 carrying the machine is placed transversel of theflooring Z resting on joists X and to be operated upon, pivoting themachine up or down on rod 16 until the bit 25 is in contact with thespot where the joists are to be bored.

The turning handle 30 is then actuated by the operator, and a rotarymotion is imparted to the bit through gear A, gear B, shaft 9, gear 0,gear D, and shaft 17, connected to the bit 25.

The hole or boring made with this machine will extend in a direct linetransversely through the board or joist and it is not necessary, as iscommonly thecase, to bore the hole at an inclination or angle throughsuch joists. After the bits have passed through the wood and the boringis made, with the left hand still on the left hand steadying hand-grip8, remove the right hand from the turning handle 30 and grasping theright hand steadying handgrip 8, the operator now pulls toward him withboth hands, and the said movement will remove the bit from the joist andthe operation of boring new holes may be proceeded with.

It will be observed that I have provided an exceedingly simple machineand one,

Patent I A portable joist-boring tool, comprising frame or casingsupporting gearing and havlng a bit chuck pro ecting from one face,

a pair of bracket plates on opposite edges of said frame having alinedperforations to receive a rod transversely to said bit projecting beyondthe frame to rockingly support the same on spaced supports and. handlegrips projecting from the opposite face at opposite edges.

. In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses.

JAMES C. MOORE.

Witnesses LILLIAN R. \VILBER, J. W. SHEPARDSON.

